JPH05223140A - Vibration control device of power transmission system for automobile - Google Patents

Abstract

PURPOSE:To prevent a propeller shaft from being damaged by a mass body even if the mass body drops off from a jointed part between the propeller shaft and a rotating shaft, because of coming off from an elastic element. CONSTITUTION:A mass body 18 is installed on a jointed part between a propeller shaft 2 and a rotating shaft 7 through an elastic element 17. This device is provided with a stopper 20 which prevents the mass body 18 from shifting to the propeller shaft 2 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolation device for an automobile power transmission system provided at a connecting portion between a propulsion shaft driven by an engine and a rotary shaft connected to the propulsion shaft.

[0002]

2. Description of the Related Art The above-mentioned anti-vibration device has a so-called dynamic damper, which has been conventionally used in the Japanese Utility Model No. 62-190.
In Japanese Patent Laid-Open No. 147, a mass body is attached to a transmission shaft, which is an object of vibration isolation, via an elastic body.
Further, conventionally, the vibration damping device having the above-described configuration may be provided in a connecting portion between a propulsion shaft that rotates by receiving power from an engine and a rotating shaft that is connected to the propulsion shaft.

[0003]

By the way, the above-mentioned conventional propelling shaft is usually a long body, has a pipe structure, and is easily damaged by an external force. Therefore, when the mass body moves toward the propulsion shaft side due to peeling from the elastic body due to fatigue of the elastic body or the like, the mass body collides with the propulsion shaft and easily damages the propulsion shaft. There is a risk that

[0004]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above-mentioned circumstances. Even when the mass body is separated from the elastic body and is dropped from the connecting portion of the propulsion shaft and the rotating shaft, The purpose is to prevent the propulsion shaft from being damaged by the mass body.

[0005]

In order to achieve the above object, the present invention is characterized in that a propulsion shaft which rotates by receiving power from an engine and a rotary shaft which is connected to the propulsion shaft are provided. In a vibration isolation device for a power transmission system for automobiles, in which a mass body is attached to the connecting portion of both shafts via an elastic body, a stopper is provided to prevent the mass body from moving to the propulsion shaft side. There is a point.

[0006]

[Operation] The operation of the above configuration is as follows. When the mass body 18 is attached to the connecting portion 13 between the propulsion shaft 2 and the input shaft (rotary shaft) 7 via the elastic body 17, the mass body 18 is prevented from moving to the propulsion shaft 2 side. A stopper 20 is provided. For this reason, when the mass body 18 is separated from the elastic body 17 due to fatigue of the elastic body 17 or the like and moves toward the propulsion shaft 2, the mass body 18
Is stopped by the stopper 20, and the mass body 18 is prevented from colliding with the propulsion shaft 2.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 and 2 show a first embodiment.
In the figure, reference numeral 1 is a power transmission device for an automobile, and an arrow Fr indicates the front of the automobile. The power transmission device 1 has a propulsion shaft 2 that rotates by receiving power from an engine, and the propulsion shaft 2 has a main body shaft 3 having a circular pipe structure in cross section that extends in the front-rear direction.
And a universal joint 4 attached to the rear end of the main body shaft 3. 5 is a differential that connects the left and right rear wheels, and this differential 5 is a differential case 6
And the input shaft 7 which is a rotating shaft supported by the differential case 6.
And the input shaft 7 is solid and has sufficient strength.

The universal joint 4 has a first flange 9 at its rear end, while the input shaft 7 has a second flange 10 at its front end. The flanges 9 and 10 are coaxially located and connected to each other by a bolt 11 and a nut 12, and the flanges 9 and 10 serve as a connecting portion 13 between the propulsion shaft 2 and the input shaft 7. An anti-vibration device (dynamic damper) 15 is attached to the connecting portion 13 coaxially therewith. The vibration isolator 15 has a substrate 16 made of sheet metal. This base plate 16 has the above-mentioned flanges 9,
It is composed of a bottom plate 16a sandwiched between 10 and fastened together by the bolt 11 and the nut 12, and a polygonal cylindrical outer peripheral plate 16b extending forward from the outer edge of the bottom plate 16a. Four arm-shaped rubber elastic bodies 17 are provided on the outer surface of the outer peripheral plate 16b at equal intervals in the circumferential direction. In addition, the mass body 1 has an annular shape coaxially with the connecting portion 13.
8 is provided, and the mass body 18 is supported by the protruding ends of the elastic bodies 17.

When the connecting portion 13 tries to vibrate during the transmission of power between the propulsion shaft 2 and the input shaft 7, the vibration is prevented by the elastic body 17 and the mass body 18. The front edge of the outer peripheral plate 16b is bent outward in the radial direction to form a flange-shaped stopper 20. The outer diameter of the stopper 20 is approximately the same as the outer diameter of the mass body 18, and the stopper 20 is provided in the mass body 18 with a slight gap 21 in the front-rear direction.

When the mass body 18 is detached from the elastic body 17 due to fatigue of the elastic body 17 or the like and the stopper 20 tries to move to the propulsion shaft 2 side, the stopper 20 moves toward the propulsion shaft 2 side. Prevent movement. Therefore, the propulsion shaft 2
Is a body longer than the input shaft 7, has a pipe structure, and is easily damaged by an external force. The damage to the propulsion shaft 2 is reliably prevented.

In the above case, the stopper 20 is the substrate 1
6 is integrally formed, and therefore, the increase in the number of parts is suppressed, and the propulsion shaft 2 is prevented from being damaged with a simple structure. When the amplitude of the mass body 18 becomes excessive, the stopper 20 contacts the mass body 18 to prevent the mass body 18 from having an excessive amplitude.

(Second Embodiment) FIGS. 3 to 5 show a second embodiment. According to this, the stopper 20 is configured as follows. That is, the stopper pin 23 is provided so as to project radially outward from the outer peripheral plate 16b of the substrate 16. The stopper pin 23 is arranged at the center of each of the elastic bodies 17, 17 adjacent to each other in the circumferential direction.

On the other hand, on the outer peripheral surface of the mass body 18, four elongated hole-shaped recesses 24 are formed at equal intervals in the circumferential direction. A long hole-shaped stopper hole 25 is formed at the bottom of each of the recesses 24, and the protruding end of the stopper pin 23 is loosely fitted in the stopper hole 25. A disk-shaped head 26 is integrally formed with the protruding end of the stopper pin 23. This head 2
6 is slightly away from the bottom of the recess 24, which allows the mass 18 to oscillate with respect to the coupling 13 with a certain amplitude.

The diameter of the head 26 is larger than the width of the stopper hole 25. Therefore, the mass body 18 is prevented from falling off the stopper pin 23. When the mass body 18 is moved from the elastic body 17 to the propelling shaft 2 side, the mass body 18 is moved by contacting the inner peripheral surface of the stopper hole 25 with the stopper pin 23. Be blocked. Since other configurations and operations are similar to those of the above-described embodiment, common reference numerals are given to the drawings, and description thereof will be omitted.

Although the above is based on the illustrated example, the input shaft 7
Alternatively, the output shaft may be an engine-side output shaft connected to the front end side of the propulsion shaft 2.

[0016]

According to the present invention, when the mass body is attached to the connecting portion of the propulsion shaft and the rotary shaft via the elastic body, the mass body is prevented from moving to the propulsion shaft side. Since the stopper is provided, when the mass body is detached from the elastic body due to fatigue of the elastic body or the like and is moved toward the propulsion shaft side, the movement of the mass body is blocked by the stopper. Therefore, although the propulsion shaft is usually a long body and has a pipe structure and is easily damaged by an external force, the mass body is prevented from colliding with the propulsion shaft. Damage to the shaft is reliably prevented.

[Brief description of drawings]

FIG. 1 is a partial side sectional view of a first embodiment.

FIG. 2 is a partially cutaway front view of the vibration damping device in the first embodiment.

FIG. 3 is a diagram corresponding to FIG. 1 in the second embodiment.

FIG. 4 is a diagram corresponding to FIG. 2 in the second embodiment.

5 is a view taken along line 5-5 of FIG. 3 in the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Power transmission device 2 Propulsion shaft 7 Input shaft (rotary shaft) 13 Connection part 15 Anti-vibration device 16 Substrate 17 Elastic body 18 Mass body 20 Stopper 21 Gap

Claims (1)

[Claims] 1. A propulsion shaft that rotates by receiving power from an engine, and a rotary shaft that is connected to the propulsion shaft are provided, and a mass body is attached to a mutual connecting portion of the both shafts via an elastic body. A vibration isolator for an automobile power transmission system, comprising a stopper for preventing the mass body from moving toward the propulsion shaft side.